Country	1983	1985	1987	1989	1991
S. Africa	48.6	43.8	36.2	30.8	28.7
U.S.	4.4	5	9.3	13.4	13.9
USSR	19.1	17.7	16.7	14.4	11.5
Australia	2.2	3.8	6.7	10.3	11.2
Canada	5.3	5.7	7	8	8.3
China	4.1	4	4.3	4	5.7
Rest	16.3	20.2	19.7	19	20.8